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14 February 2008 Novel chip coating approaches to improve white LED technology
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Key market requirements for white LEDs, especially in the general lighting and automotive headlamp segments call for improved concepts and performance of white LEDs based on phosphor conversion. Major challenges are small emission areas, highest possible intensities, long-term color stability, and spatial homogeneity of color coordinates. On the other hand, the increasingly high radiation power of the blue LEDs poses problems for all involved materials. Various thick film coating technologies are widely used for applying the color conversion layer to the semiconductor chip. We present novel concepts based on Silicate phosphors with high performance in terms of spatial homogeneity of the emission and variability of the color temperature. Numerical calculation of the optical properties with the help of state-of-the-art simulation tools was used as a basis for the practical optimization of the layer geometries.
© (2008) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Paul Hartmann, Marko Schweighart, Christian Sommer, Franz-P. Wenzl, Ernst Zinterl, Hans Hoschopf, Peter Pachler, and Stefan Tasch "Novel chip coating approaches to improve white LED technology", Proc. SPIE 6910, Light-Emitting Diodes: Research, Manufacturing, and Applications XII, 69101A (14 February 2008);


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